I should explain the whole story then...
I remember trying to encode something with virtual dub or something and the computer just froze and started making that noise.
Then I turned off computer and turned it on and it was very very slow and the same noise was coming up.
Then I saw one of my partitions on the drive was corrupted and stuff so I deleted and everything was back to working normal and normal speed and my other partitions were fine, it was just that partition I was trying to save my encoded video file got corrupted and that partition is all screwed up now and I can't do anything with it but I still have my 2 other ones. But sometimes like I said every 5-10 minutes, it still makes that noise which is so annoying